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Flood deposits include flood debris and shells of molluscs. Such assemblages of dead remnants of molluscs are called thanatocoenoses. Shells may com from any locality anywhere in the upper river drainage, but you can get shells of some species, that can not be obtained easily.

Flood debris from the Danube river in Slovakia:It may seem, that there are only valves of a freshwater bivalve Corbicula fluminea.

But after a closer look there are many gastropod shells too. The following species of gastropods can be recognized on the photo: